Commentics

Commentics is an advanced PHP comment script with many features.

CommentLuv

CommentLuv provides plugin that enables readers to post their comments.

Commentar is a self hosted open source commenting system which can easily be integrated into any…

Commentbox is a jsf component that allows quick realization of a comment functionality

A fast, bloat-free comments system to foster discussion on your website

Disqus is a global comment system that improves discussion on websites and connects conversations across the web.

A native WordPress Disqus alternative with a focus on speed and privacy: 100% realtime native…

Facebook comments plugin lets people comment on content on the site using their Facebook account.

A free comment service allowing website owners to instantly add a comment system to any website or blog.

IntenseDebate’s comment system enhances and encourages conversation on your blog or website.

Isso – Ich schrei sonst – is a lightweight commenting server written in Python and JavaScript.

JLex Comment is a comment system for Joomla.

Easy to set up, ad-free and reliable comment system

LiveRe provides comment management and content response solutions.

Master Comments System is a very compact comments system with basic options:

Metype is a complete engagement solution.

Padlet Briefcase provides a virtual canvas for team collaboration that can be used for venn diagram, discussion board or for a business plan

RbComment - Zend Framework 2 module for drop-in, self-hosted comments, with email notifications…

Remarkbox offers a free comment system to keep readers engaged with your content.

coComment is a service for managing, powering and researching conversations online.

jskomment is an open source commenting system that is built on javascript and AJAX.

talkatv is an open source comment service much like …